Rework structure

[dragonblocks_alpha.git] / src / common / color.c

diff --git a/src/common/color.c b/src/common/color.c
new file mode 100644 (file)
index 0000000..e1689c7
--- /dev/null
+++ b/src/common/color.c
@@ -0,0 +1,40 @@
+#include "common/color.h"
+
+static f32 hue_to_rgb(f32 p, f32 q, f32 t)
+{
+    if (t < 0.0f)
+        t += 1.0f;
+
+    if (t > 1.0f)
+        t -= 1.0f;
+
+    if (t < 1.0f / 6.0f)
+        return p + (q - p) * 6.0f * t;
+
+    if (t < 1.0f / 2.0f)
+        return q;
+
+    if (t < 2.0f / 3.0f)
+        return p + (q - p) * (2.0f / 3.0f - t) * 6.0f;
+
+    return p;
+}
+
+v3f32 hsl_to_rgb(v3f32 hsl)
+{
+       v3f32 rgb;
+
+    if (hsl.y == 0.0f) {
+               rgb = (v3f32) {hsl.z, hsl.z, hsl.z};
+    } else {
+        f32 q = hsl.z < 0.5f ? hsl.z * (1.0f + hsl.y) : hsl.z + hsl.y - hsl.z * hsl.y;
+        f32 p = 2.0f * hsl.z - q;
+
+        rgb.x = hue_to_rgb(p, q, hsl.x + 1.0f / 3.0f);
+        rgb.y = hue_to_rgb(p, q, hsl.x);
+        rgb.z = hue_to_rgb(p, q, hsl.x - 1.0f / 3.0f);
+    }
+
+    return rgb;
+}
+